[POC: Unmergeable] Idea on component-based theming

[cchaos]

Theming ideas

Can prop values be generated through the global theme layer?
This is all conjecture since I don't know if the provider can be used this way.

Example: Buttons

Amsterdam theme:

export const BUTTON_COLORS = ‘primary’ | ‘success’;
export const useEuiButtonColorCSS = () => {
  const euiTheme = useEuiTheme();
  return {
    primary: `
      background-color: ${euiButtonColor('primary', euiTheme)};
    `,
    success: `
      background-color: ${euiButtonColor('success', euiTheme)};
    `,
  }
}

Somehow the EuiThemeProvider should expect certain component prop type options like

EuiButtonProps[‘color’]: EuiThemeProvider.theme.button.colors

Then the button component would pull the available prop's map and related styling via the provider:

export type ButtonColor = EuiThemeProvider.theme.button.colors;
export const EuiButton: FunctionComponent<Props> = ({
  color,
)} => {
  const style = [useEuiButtonColorCSS[color]];
}
export const EuiBottomBar = forwardRef<HTMLElement, EuiBottomBarProps>(
  (props, ref) => {
    const BottomBar = _EuiBottomBar;
    return (
      <EuiThemeProvider colorMode={'dark'}>
        <BottomBar ref={ref} {...props} />
      </EuiThemeProvider>
    );
  }
);

This screenshots show how the docs is still looping through manual list of previously available colors, but only 3 of which are available in this theme.

---

The nice thing about this approach, is it will separate basic / functional styles from purely visual ones. Perhaps open up a way to make those basic / functional styles static.

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